When it comes to architecting jobs for VMware vSphere virtual machines, the Automatic option for the Transport mode proxy configuration is the best option if you are not giving too much thought to the configuration. The Automatic option goes through a number of communications options checks to see what’s available on the proxy and determine the best way to back up the VM. This decision process has a number of factors that go into the mode selection for the active job. Direct SAN access is favored first in all situations, virtual appliance hot-add as the next best thing, and Network Mode as the common denominator to work in most every situation to sum up the process.
3 Indications to use Network Mode over hot-add for vSphere Backups